Bathtub



FIG. 1 is a perspective view taken from the top, front and left side of a bathtub showing my design;

FIG. 2 is a top view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a cross-sectional view taken on line 4--4 of FIG. 1; and,

FIG. 5 is a cross-sectional view taken on line 5--5 of FIG. 1. 

The ornamental design for a bathtub, as shown and described. 